LED light bulb

ABSTRACT

The lighting device includes at least one filament module, a base, at least one pillar, and a base. The filament module includes more than two filaments. Each filament includes a substrate, multiple LED chips, a phosphor film, a top extended electrode, and a bottom extended electrode. Multiple LED chips are mounted on the substrate. The phosphor film covers the substrate and multiple LED chips. The top extended electrode and bottom extended electrode are connected to two ends of the substrate respectively. At least part of top extended electrode and bottom extended electrode are not covered by the phosphor film, and each top extended electrode of the filaments is fixed together.

RELATED APPLICATION

The present application is a continuation application of U.S.application Ser. No. 16/725,156, which is a continued application ofU.S. application Ser. No. 15/944,757.

FIELD OF THE INVENTION

The present invention relates to a lighting device and a manufacturingmethod of lighting devices, and more particularly to a LED (Lightemitting diode) lighting device and a manufacturing method of LEDlighting devices.

BACKGROUND

Lighting is an important part of human life. Since Thomas Edison hasinvented electric lighting, the life of human being was widely changed.With the improvement in LED (Light emitting diode) technology and thedecrease in cost, LED technology rapidly extends to various lightfixtures and applications.

Compared with traditional incandescent light bulbs, LED usually hasbetter luminous efficacy. However, LED components have limitations inheat resistance. If the problems of heat dissipation can be solvedeffectively, the life span of LED and the stability of light fixtureswould be greatly improved.

Light bulbs are an important part of a light fixture. Because lightbulbs are used for a long period, people have given impressions andpreferences of the shape of light bulbs. Currently there are LED lightbulbs designed to resemble traditional incandescent light bulbs in themarket. However, the production process of LED light bulbs similar toincandescent light bulbs in appearance often faces the problems of weakstructures and complicate assembly.

The present invention focuses on the technical problems of these kind oflight bulbs. The present invention shows improvements in cost,reliability of products, and production cost.

SUMMARY OF INVENTION

The present invention provides an improved lighting device according tothe first embodiment of the present invention. The lighting deviceincludes at least one filament module, a base, at least one pillar, anda base.

The filament module includes more than two filaments. Each filamentincludes a substrate, multiple LED chips, a phosphor film, a topextended electrode, and a bottom extended electrode. Multiple LED chipsare mounted on the substrate. The phosphor film covers the substrate andmultiple LED chips. The top extended electrode and bottom extendedelectrode are connected to two ends of the substrate respectively. Atleast part of top extended electrode and bottom extended electrode arenot covered by the phosphor film, and each top extended electrode of thefilaments is fixed together.

The bottom of the pillar is connected to the base. Multiple top extendedelectrodes of the filaments of the filament module hang on the top ofthe pillar. A driver circuit electrically connects to multiple bottomextended electrodes of the filaments of the filament module. The basecontains the driver circuit. The base is used to connect to the power.

In some embodiments, multiple top extended electrodes of the filamentsof the filament module may connect to each other, then the combinationof multiple top extended electrodes connects to the top of the pillar.In other words, the highest parts of the filaments may be assembledfirst, then the highest parts of the filaments are fixed to the top ofthe pillar.

In some embodiments, multiple top extended electrodes of the filamentsof the filament module are integrally formed. In this kind ofmanufacturing method, the stability and conductivity of the filament arefurther improved, and the unnecessary problem of temperature increasegets better.

In some embodiments, the connection part of the top extended electrodesof multiple filaments may have a ring. The ring is put into the top ofthe pillar.

In some embodiments, the top extended electrode of the filament is madewith a ring, and the top of the pillar is inserted into the ring. Inother words, compared with traditional method of fixing the stickelectrodes by welding, this method further improves the stability of thefilaments.

In some embodiments, the number of the pillar is more than two, andmultiple fila

In some embodiments, the pillar is a thin piece of metal. For example,the pillar may be made of iron-nickel alloys with certain hardness.

In some embodiments, the top of the pillar includes an insulation part.The insulation part has a support structure used to hold multiple topextended electrodes of the filaments of the filament module. In otherwords, the insulation part avoids a short circuit, causing by assemblyor vibration, when certain filaments are electrically connected.

In some embodiments, the above-mentioned insulation part may be made ofglass.

In some embodiments, the pillar in the area of insulation part may beall made of glass.

In some embodiments, the insulation part is made of plastic. Plastic mayfurther reduce the overall cost. Plastic are easier to produce arelatively complicated stand, and the stand is used to support and fixthe connection parts of the filaments.

In some embodiments, the support structure is a slot at the top of theinsulation part. In other words, the mounting of the filaments becomesmore stable with gloves, holes, and soon.

In some embodiments, the support part of the pillar is an extendedcomponent set in the insulation part. For example, the support part maybe made out of metal sticks, and the pillar may be made of plastic ormetal. The support part, like metal sticks and so on, is set in thepillar in the production process of the pillar. In this way, thestability is improved, and the complexity of assembly is reduced.

In some embodiments, the extended component is a metal stick. Theextended component includes an inner part and an extended part. Theinner part of the extended component is set in the insulation part. Theextended part of the extended component is stretched away from theinsulation part. The top extended electrodes of multiple filaments ofthe filament module hang on the extended part of the extended component.

In some embodiments, a bottom electrical connection structure extendsfrom the base. The bottom electrical connection structure electricallyconnects to the driver circuit. The bottom extended electrodes ofmultiple filaments of the filament module electrically connect to thebottom electrical connection structure, and multiple filaments areelectrically connected in series or parallel.

In some embodiments, the bottom electrical connection structure has anannular metallic strip. By cutting off the annular metallic strip,multiple filaments are electrically connected in series or parallel.

In some embodiments, the bottom extended electrodes of multiplefilaments are fixed to the bottom electrical connection structure andthus to allow the angle between each filament and the pillar to be morethan fifteen degrees.

In some embodiments, an insulator is put over a pair of connection partsof the top extended electrodes of the filaments, and another a pair ofconnection parts of the top extended electrodes of the filaments arefixed to the pillar over the insulator.

The present invention provides a manufacturing method of a lightingdevice according to another view of the present invention. Themanufacturing method includes steps as follows.

A filament module is provided. The filament module includes at least twofilaments. The filament includes a substrate, multiple LED chips, aphosphor film, a top extended electrode, and a bottom extendedelectrode. Multiple LED chips are mounted on the substrate. The phosphorfilm covers the substrate and multiple LED chips. The top extendedelectrode and bottom extended electrode are connected to two ends of thesubstrate respectively. At least part of top extended electrode andbottom extended electrode are not covered by the phosphor film. Each topextended electrode of the filaments is fixed together.

One or multiple filament modules are fixed to the pillar of the lightingdevice. The pillar is mounted on the base of the lighting device.

In some embodiments, this manufacturing method further includes aproducing way of cutting a metal plate to produce the substrate, the topextended electrode, and the bottom extended electrode of the filamentmodules.

According to different embodiments as above, the present invention makesit possible to decrease the cost with varying degrees, improve thestability of filaments, and simplify the production process.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates an embodiment of lighting device.

FIG. 2A illustrates a connection way of filaments.

FIG. 2B is a top view of FIG. 2A.

FIG. 3A illustrates another connection way of filaments.

FIG. 3B is a top view of FIG. 3A

FIG. 4A illustrates an embodiment of filaments.

FIG. 4B is a partial perspective view of filaments.

FIG. 5 illustrates an embodiment of fixing filaments.

FIG. 6 is a flowchart of a manufacturing method of a lighting device.

DETAILED DESCRIPTION

Firstly, please refer to FIG. 1. FIG. 1 is an exploded perspective viewof lighting device components according to an embodiment of the presentinvention.

In the lighting device of FIG. 1, multiple filaments 102 are set in acover 101. One end of multiple filaments 102 are fixed to the upper endof the pillar, and the other ends of multiple filaments 102 are fixed tothe base 103. The driver circuit 104 is set in the heat exchanger cup105. The heat exchanger cup 105 is set in the base 106. The base 106connects to the external power supply such as standard Edison lampholder through the electrical foot contact 107 and the side electrodePlease refer to FIG. 2A and FIG. 2B. FIG. 2A shows a connection type offilaments. FIG. 2B is a top view of FIG. 2A.

In FIG. 2A and FIG. 2B, the top extended electrodes of four filaments201, 202, 203, 204 connect as in the drawings, the top extendedelectrodes of four filaments 201, 202, 203, 204 are fixed to the pillar21, 22. Four filaments 201, 202, 203, 204 are electrically connected asplanned through an annular metallic support strip extended from thebase.

In this embodiment, two of filaments 201, 202, 203, 204 are electricallyconnected in series, while others are electrically connected inparallel. The annular metallic support strip extended from the base maybe cut off according to different connection types. In other words, theannular metallic support strip as in the drawings may be cut offaccording to different connection types of filaments in the productionprocess, thus to form different connection types of filaments.

Please refer to FIG. 3A and FIG. 3B. FIG. 3A illustrates anotherconnection way of filaments. FIG. 3B is a top view of FIG. 3A.

Four filaments 301, 302, 303, 304 of FIG. 3A and FIG. 3B areelectrically connected in series. Compared with the embodiment of FIG.2A and FIG. 2B, the connection type of the tops of the filaments andannular metallic support strip extended from the base are roughlysimilar, two embodiments differ in the way of cutting off annularmetallic support strip.

In other words, in these embodiments, the annular metallic supportstrips are basically the same, and the base with the same annularmetallic support strip may be produced in large numbers. In thesubsequent production process, a series connection or a parallelconnection are formed by changing the break point of the annularmetallic support strip or changing the connection type between thefilaments and the annular metallic support strip. This methodsignificantly reduces the production cost.

FIG. 4A shows an embodiment of filaments.

In FIG. 4A, two top extended electrodes 411, 421 are connected to thefilament 41, 42 respectively, each top extended electrode and filamentare manufactured in pair, or each top extended electrode is fixed to thefilament before the top extended electrode is fixed to the pillar. Inthis embodiment of FIG. 4A, there is a ring between the top extendedelectrodes 411, 421. The ring is put into the top of the pillardirectly, the stability of fixing is strengthened, and the productionprocess accelerates.

In other words, with this filament structure, people just make the topextended electrodes of the filaments hang on or weld to the top of thepillar, then make the bottom extended electrodes 422, 412 connect to thebase, such as the annular metallic support strip as above.

FIG. 4B is a partial perspective view of filaments. The filamentincludes a substrate 454. A LED module 452 is mounted on the substrate,and the phosphor film 451 is set on the substrate. Two ends of thesubstrate 454 are formed into electrodes 453.

FIG. 5 shows an embodiment of fixing the filaments.

In FIG. 5, the top extended electrodes 511, 521 of the filaments 51, 52are fixed together, then the top extended electrodes 511, 521 are put atthe top 531 of the pillar 53. In this embodiment, the top 531 of thepillar 53 is insulated and provided with a slot.

The present invention provides an improved lighting device according tothe first embodiment of the present invention. The lighting deviceincludes at least one filament module, a base, at least one pillar, anda base.

The filament module includes more than two filaments. Each filamentincludes a substrate, multiple LED chips, a phosphor film, a topextended electrode, and a bottom extended electrode. Multiple LED chipsare mounted on the substrate. The phosphor film covers the substrate andmultiple LED chips. The top extended electrode and bottom extendedelectrode are connected to two ends of the substrate respectively. Atleast part of top extended electrode and bottom extended electrode arenot covered by the phosphor film, and each top extended electrode of thefilaments is fixed together.

The bottom of the pillar is connected to the base. Multiple top extendedelectrodes of the filaments of the filament module hang on the top ofthe pillar. A driver circuit electrically connects to multiple bottomextended electrodes of the filaments of the filament module. The basecontains the driver circuit. The base is used to connect to the power.

In some embodiments, multiple top extended electrodes of the filamentsof the filament module may connect to each other, then the combinationof multiple top extended electrodes connects to the top of the pillar.In other words, the highest parts of the filaments may be assembledfirst, then the highest parts of the filaments are fixed to the top ofthe pillar.

In some embodiments, multiple top extended electrodes of the filamentsof the filament module are integrally formed. In this kind ofmanufacturing method, the stability and conductivity of the filament arefurther improved, and the unnecessary problem of temperature increasegets better.

In some embodiments, the connection part of the top extended electrodesof multiple filaments may have a ring. The ring is put into the top ofthe pillar.

In some embodiments, the top extended electrode of the filament is madewith a ring, and the top of the pillar is inserted into the ring. Inother words, compared with traditional method of fixing the stickelectrodes by welding, this method further improves the stability of thefilaments.

In some embodiments, the number of the pillar is more than two, andmultiple filaments hang on the tops of the pillars.

In some embodiments, the pillar is a thin piece of metal. For example,the pillar may be made of iron-nickel alloys with certain hardness.

In some embodiments, the top of the pillar includes an insulation part.The insulation part has a support structure used to hold multiple topextended electrodes of the filaments of the filament module. In otherwords, the insulation part avoids a short circuit, causing by assemblyor vibration, when certain filaments are electrically connected.

In some embodiments, the above-mentioned insulation part may be made ofglass.

In some embodiments, the pillar in the area of insulation part may beall made of glass.

In some embodiments, the insulation part is made of plastic. Plastic mayfurther reduce the overall cost. Plastic are easier to produce arelatively complicated stand, and the stand is used to support and fixthe connection parts of the filaments.

In some embodiments, the support structure is a slot on the top of theinsulation part. In other words, the mounting of the filaments becomesmore stable with gloves, holes, and soon.

In some embodiments, the support part of the pillar is an extendedcomponent set in the insulation part. For example, the support part maybe made out of metal sticks, and the pillar may be made of plastic ormetal. The support part, like metal sticks and so on, is set in thepillar in the production process of the pillar. In this way, thestability is improved, and the complexity of assembly is reduced.

In some embodiments, the extended component is a metal stick. Theextended component includes an inner part and an extended part. Theinner part of the extended component is set in the insulation part. Theextended part of the extended component is stretched away from theinsulation part. The top extended electrodes of multiple filaments ofthe filament module hang on the extended part of the extended component.

In some embodiments, a bottom electrical connection structure extendsfrom the base. The bottom electrical connection structure electricallyconnects to the driver circuit. The bottom extended electrodes ofmultiple filaments of the filament module electrically connect to thebottom electrical connection structure, and multiple filaments areelectrically connected in series or parallel.

In some embodiments, the bottom electrical connection structure has anannular metallic strip. By cutting off the annular metallic strip,multiple filaments are electrically connected in series or parallel.

In some embodiments, the bottom extended electrodes of multiplefilaments are fixed to the bottom electrical connection structure andthus to allow the angle between each filament and the pillar to be morethan fifteen degrees.

In some embodiments, an insulator is put over a pair of connection partsof the top extended electrodes of the filaments, and another a pair ofconnection parts of the top extended electrodes of the filaments arefixed to the pillar over the insulator.

Please refer to FIG. 6. The present invention provides a manufacturingmethod of a lighting device according to another view of the presentinvention. The manufacturing method includes steps as follows.

Cut a metal plate to produce the substrate, the top extended electrode,and the bottom extended electrode of the filament modules (step 61).

A filament module is provided (step 62). The filament module includes atleast two filaments. The filament includes a substrate, multiple LEDchips, a phosphor film, a top extended electrode, and a bottom extendedelectrode. Multiple LED chips are mounted on the substrate. The phosphorfilm covers the substrate and multiple LED chips. The top extendedelectrode and bottom extended electrode are connected to two ends of thesubstrate respectively. At least part of top extended electrode andbottom extended electrode are not covered by the phosphor film. Each topextended electrode of the filaments is fixed together.

One or multiple filament modules are fixed to the pillar of the lightingdevice (step 63). The pillar is mounted on the base of the lightingdevice.

In some embodiments, this manufacturing method further includes aproducing way of cutting a metal plate to produce the substrate, the topextended electrode, and the bottom extended electrode of the filamentmodules.

According to different embodiments as above, the present invention makesit possible to decrease the cost with varying degrees, improve thestability of filaments, and simplify the production process.

In addition to embodiments as above, the present invention may haveother applications or designs, and as long as they are within the spiritof the present invention, the various designs still belong to the scopeof the present invention.

The invention claimed is:
 1. A LED light bulb, comprising: multiplefilaments, wherein each filament comprises a substrate, multiple LEDchips, a phosphor film on two sides of the substrate, a top extendedelectrode, and a bottom extended electrode, multiple LED chips aremounted on the substrate, the phosphor film covers the substrate andmultiple LED chips, the top extended electrode and the bottom extendedelectrode are connected to two ends of the substrate respectively, atleast part of the top extended electrode and the bottom extendedelectrode are not covered by the phosphor film, and each top extendedelectrode of the filaments is fixed together; a base; at least onepillar, wherein the bottom of the pillar is connected to the base,multiple top extended electrodes of the multiple filaments hang on thetop of the pillar; and a base, wherein the base contains the drivercircuit, the base is used to connect to the power, wherein the top ofthe pillar is used to support the multiple filaments.
 2. The LED lightbulb of claim 1, wherein multiple top extended electrodes of themultiple filaments connect to each other, then the combination ofmultiple top extended electrodes connects to the top of the pillar. 3.The LED light bulb of claim 1, wherein multiple top extended electrodesof the multiple filaments are integrally formed.
 4. The LED light bulbof claim 3, wherein a connection of the top extended electrodes of themultiple filaments have a ring, the ring is put into the top of thepillar.
 5. The LED light bulb of claim 1, wherein the top extendedelectrodes of the multiple filaments have a ring, the ring is put intothe top of the pillar.
 6. The LED light bulb of claim 1, wherein thenumber of the pillar is more than two, and the multiple filaments hangon the tops of the pillars.
 7. The LED light bulb of claim 1, whereinthe pillar is a thin piece of metal.
 8. The LED light bulb of claim 1,wherein an insulation part of the top of the pillar is made of glass. 9.The LED light bulb of claim 1, wherein the pillar in the area ofinsulation part is all made of glass.
 10. The LED light bulb of claim 1,wherein an insulation part of the top of the pillar is made of plastic.11. The LED light bulb of claim 1, wherein the support structure of thepillar is a slot at an insulation part of the top of the pillar.
 12. TheLED light bulb of claim 1, wherein the support part of the pillar is anextended component set in an insulation part of the top of the pillar.13. The LED light bulb of claim 12, wherein the extended component is ametal stick, the extended component includes an inner part and anextended part, the inner part of the extended component is set in theinsulation part, the extended part of the extended component isstretched away from the insulation part, the top extended electrodes ofthe multiple filaments hang on the extended part of the extendedcomponent.
 14. The LED light bulb of claim 1, further comprising abottom electrical connection structure, the bottom electrical connectionstructure extends from the base, the bottom electrical connectionstructure electrically connects to the driver circuit, the bottomextended electrodes of the multiple filaments electrically connect tothe bottom electrical connection structure, and the multiple filamentsare electrically connected in series or parallel.
 15. The LED light bulbof claim 14, wherein the bottom electrical connection structure has anannular metallic strip, by cutting off the annular metallic strip, themultiple filaments are electrically connected in series or parallel. 16.The LED light bulb of claim 15, wherein the bottom extended electrodesof the multiple filaments are fixed to the bottom electrical connectionstructure and thus to allow the angle between each filament and thepillar to be more than fifteen degrees.